1919959 has 2 divisors, whose sum is σ = 1919960. Its totient is φ = 1919958.

The previous prime is 1919947. The next prime is 1919987. The reversal of 1919959 is 9599191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1919959 - 2⁵ = 1919927 is a prime.

1919959 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1919459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959979 + 959980.

It is an arithmetic number, because the mean of its divisors is an integer number (959980).

2^1919959 is an apocalyptic number.

1919959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919959 is an equidigital number, since it uses as much as digits as its factorization.

1919959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32805, while the sum is 43.

The square root of 1919959 is about 1385.6258513755. The cubic root of 1919959 is about 124.2884155337.

It can be divided in two parts, 1919 and 959, that multiplied together give a triangular number (1840321 = T₁₉₁₈).

The spelling of 1919959 in words is "one million, nine hundred nineteen thousand, nine hundred fifty-nine".